Chemistry Review Flashcards Preview

Gr 12 Biology > Chemistry Review > Flashcards

Flashcards in Chemistry Review Deck (9):
1

What is electronegativity?

The measure of an atoms attraction to shared electrons (strength of attraction)

2

When EN is high...
When EN is low...

High: attraction to electrons in a covalent bond creates a slightly negative charge

Low: creates a slightly positive charge

Ex H2O : H slightly positive, O slightly negative

3

What is a polar molecule?

Unequal sharing of electrons

4

A molecules biological function is determined by 3 factors

1. Overall molecular shape
2. Molecular polarity
3. Type of bond

5

Water is _____

Polar

6

Water molecules forming with other water molecules is called

Cohesion

7

Water molecules form hydrogen bonds with other polar molecules is called

Adhesion

8

What kind of bond is very biologically significant?

Hydrogen bonds

9

Why do pants get wet after walking through short, dewy grass ?

Polar molecules attract polar, therefore cotton molecules in pants attract hydrogen bonds in the water

Another example is paper towel